Compiler warning fix [byuu]

zsnes/src/chips/dsp1emu.c

@@ -82,7 +82,6 @@ void Stop_Log (void)
 
 #endif
 
-
 /***************************************************************************\
 *  Math tables                                                              *
 \***************************************************************************/
@@ -93,6 +92,10 @@ double *SinTable2;
 #define Angle(x) (((x)/(65536/INCR)) & (INCR-1))
 #define Cos(x) ((double) CosTable2[x])
 #define Sin(x) ((double) SinTable2[x])
+// gcc warning fix
+#ifdef PI
+#undef PI
+#endif
 #define PI 3.14159265358979323846264338327
 
 double Atan(double x)